WFRF:(Owocki S. P.)
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The magnetic early B-type stars - IV. Breakout or leakage? : H α emission as a diagnostic of plasma transport in centrifugal magnetospheres
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- Shultz, M. E. (författare)
- Univ Delaware, Dept Phys & Astron, 217 Sharp Lab, Newark, DE 19716 USA.;Univ Delaware, SARA, 217 Sharp Lab, Newark, DE 19716 USA.
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- Owocki, S. (författare)
- Univ Delaware, Dept Phys & Astron, 217 Sharp Lab, Newark, DE 19716 USA.;Univ Delaware, SARA, 217 Sharp Lab, Newark, DE 19716 USA.
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- Rivinius, Th (författare)
- ESO European Org Astron Res Southern Hemisphere, Casilla 19001, Santiago 19, Chile.
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- Univ Delaware, Dept Phys & Astron, 217 Sharp Lab, Newark, DE 19716 USA;Univ Delaware, SARA, 217 Sharp Lab, Newark, DE 19716 USA. ESO European Org Astron Res Southern Hemisphere, Casilla 19001, Santiago 19, Chile. (creator_code:org_t)
- 2020-10-23
- 2020
- Engelska.
- Ingår i: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966. ; 499:4, s. 5379-5395
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Rapidly rotating early-type stars with strong magnetic fields frequently show H alpha emission originating in centrifugal magnetospheres (CMs), circumstellar structures in which centrifugal support due to magnetically enforced corotation of the magnetically confined plasma enables it to accumulate to high densities. It is not currently known whether the CM plasma escapes via centrifugal breakout (CB), or by an unidentified leakage mechanism. We have conducted the first comprehensive examination of the H alpha emission properties of all stars currently known to display CM-pattern emission. We find that the onset of emission is dependent primarily on the area of the CM, which can be predicted simply by the value B-K of the magnetic field at the Kepler corotation radius R-K. Emission strength is strongly sensitive to both CM area and B-K. Emission onset and strength are not dependent on effective temperature, luminosity, or mass-loss rate. These results all favour a CB scenario; however, the lack of intrinsic variability in any CM diagnostics indicates that CB must be an essentially continuous process, i.e. it effectively acts as a leakage mechanism. We also show that the emission profile shapes are approximately scale-invariant, i.e. they are broadly similar across a wide range of emission strengths and stellar parameters. While the radius of maximum emission correlates closely as expected to R-K, it is always larger, contradicting models that predict that emission should peak at R-K.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: circumstellar matter
- stars: early-type
- stars: magnetic field
- stars: massive
- stars: rotation
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- Shultz, M. E.
- Owocki, S.
- Rivinius, Th
- Wade, G. A.
- Neiner, C.
- Alecian, E.
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- Kochukhov, Oleg
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- Petit, V
- Cerrahoglu, P.
- Fine, R.
- Henson, G.
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